Helmet liner



FIG. 1 is a right side view of a helmet liner showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a top, front and right side perspective view thereof;

FIG. 5 is another top, front and right side perspective view thereof; and,

FIG. 6 is a bottom view thereof. 

CLAIM I claim the ornamental design for a helmet liner, as shown and described. 